William hadi



W. HADDEN.

RAILROAD SIGNAL.

m N N w m 2W w 4 m l WITN NITED STATES Erica.

PATENT RAILROAD-SIGNAL.

SPECIFICATION forming part of Letters Patent No. 349,040, dated September 14, 1886.

I Application filed April ii, 1885. Serial No. 161,375. (No model.)

To all whom it may concern.-

lay-magnets by the action of the said magnet on its own armature-lever, as hereinafter more fully described.

For the sake of convenience in describing my improved signal, I have indicated the opposite ends of the track-section to be protected as north and south. The signal line-wire A, running parallel with the track-section B,ineludes one or more signal-magnets, 0, adapted to operate signal-banners D in the usual way. At opposite ends of the line A are placed relay-magnets E E, provided with armature-levers F F, each havingaretractile spring, and

adapted to be moved by its magnet.

At the end of the track-section B which I have indicated as the north end I have placed two ci rcuit-breakin g track-instru ments,

7 G G, of the usual well-known construction,

and at the opposite end of the track-section B, I have placed two circuit-breaking trackinstruments, G G. The lever of the trackinstrument G is connected with the earth-connection E, and the contact-point of the said track-instrument is connected with one pole of the battery H by the wire a, and the opposite pole of the battery His connected with one terminal of the relay E by the wire I), the remaining terminal of which is connected with the line A. A wire, 11, connects the back contact-point, c, of the armature-leverE with the wire 6, leading from the battery H to the relay-magnet E. The armature-lever Fis connected by a wire, d, with the lever ofthe trackinstrument G, and the contact-point of the said track-instrument is connected by a wire,

e, with the line A between the first signalmagnet O and the relay-magnet E.

The track-instruments, the relay-magnet, and its armature-lever at the opposite end of the track-section B, which I have indicated as south, are oppositely arranged with respect to the 1ine-wire and track-section, but connected up in a similar way-that is to say, the lever of the track-instrument G is connected with the ground E. The contactpoint of the track-instrument G is connected by the wire a with one terminal of the.

relay-magnet E, the other terminal of the said magnet being connected with the line-wire A. The back contact-point, c, of the armaturelever E is connected by a wire, b, with the wire a, and the armature-lever F is connected with the lever of the track-instrument G by the wire (1, the contact-point of the said track-instru ment being connected with the line-wire A by a wire, 0. When the armature-levers F F are released by their magnets, they are removed by their retractile springs so as to bring their free ends into contact with their respective back contact-points cc, as shown in the drawing. The relaymagnets E E are then cut out of the circuit or shunt-circuited, so that the current from the battery H passes in one direction through the wire a and track-instrument G to the ground E, and in the opposite direction through the wires I) I), back contact 0, armature-lever F, wire (I, track-instrument G, wire e, to the line A, and through the signal-magnets 0 included in the line to the wire 6, thence through the track-instrument G, wired, armature-lever F, back contact 0, wire 1), wire a, track-instrument G, to the ground 13. \Nith the line in this condition the signal-magnets C C are energized and the banners I) D are thrown up and sustained in the position shown in the drawing, indicating safety. A train entering the section B first engages the lever of the track-instrument G, breaking the battery-circuit at that point'and momentarily affecting the signal-magnets G 0 so that their armatures are released but no permanent indication is secured unless the track-instrument G is held continually open until the track-instrument G is reached, when the interruption of the circuit by the movement of the lever of the said traclcinstrument compels the currentfrom the battery H to pass through the relay-magnet E, whose resistance is so great as to reduce the current to such an extent as to allow the signalanagnets C G to release their armatures, allowing the banners DD to drop,indicating danger. At the same time the core of the relay-magnet E, being energized, attracts the armature-lever F, withdrawing it from the back contact 0, holding the said armature-lever in this position after the track-instrument G has been passed by the t 'ain, causing the battery-current still to flow through the relay-magnet E, so long as the armature-lever F audits back contact 0 are separated. When the train on the tracksection B reaches the track-instrument- G and moves the lever of the said track-instrument, breaking the circuit between the lever and the contact-point, causing the current from the line A to momentarily flow through the relay E and its connections to the ground E, the core of the relay-magnet E, being by this means energized, attracts the armature-lever F and breaks the circuit between the free end of the said armature-lever and the back contact-point 0, but produces no other ellect. Vhen the train reaches the 1rack-instrument i and moves its lever so as to break the circuit at that point, the current ceases to flow through the line and magnets C O and E E. The armature-levers 11 F, being released and drawn back by their retractile springs, conr plete the circuit around the relaymagnets E E and permit the full flow of the current over the line and through the signal magnets O, and the said magnets, being energized again, attract their armatures and raise the banners I), indicating safety. \Yhen the train enters the track-section 13 from the south, the lover of the track-instrument Gis moved so as to interrupt the circuit while the train is passing over it; but this produces no effect other than the momentary disturbance of the current passing over theline; but when a train passes over the track-instrument G it interrupts the branch of the circuit passing through the wire 1/; back contact 0, armature-levcr F, and wire 1 causing the entire current passing over the line to go through the relay-magnet E, the resistance of which reduces the strength of the current so that the signal-magnets U are unable to support the banners I), when the said banners drop, indicating danger. through the relay-magnet E, its core becomes energized and the armature F is drawn forward toward the magnet, breaking the circuit in the branch I) c, armature-lever F, and wire (1, and the armature-lever is held in this position until the circuit is again interrupted by the passage of the train over the traek-instrument G, when the mmatnre-lever F will be released, the branch circuit around the relay- \V hen the current passes magnet D will be again established, and the full current flowing through the signal-magnets 0 will cause them to act on their armatures and return the banners l) to the position of safety.

The advantage secured by my invention is,

from the circuit without the employment of the attractive force of a relay situated in a circuit of great resistance. Thus in my device much less battery-power isrequircd to accomplish the same result.

Having thus described my invent-ion, what I claim as new, and desire to secure by .llctters lateut, is

1. The combination of the eartlrterminals E E, the battery ll, and the resistance-coil E, with a line of wire running from one pole of the resistance-coil to the terminal E, the line of wire running from the terminal E to the battery, the wire 1), connecting the battery with the opposite pole of the resistance coil to that from which the line to the terminal E runs, the wire I), the eontaetpoint v, the pivoted spring-controlled armature-lever F, arranged to come into contact with the magnet ot' the resistance-coil, and thereby break circuit with the contactpoint c, the wire (I, the circuit-breaker G, and wire 0, the electromagnet C, oflow resistance, and the signal I), operated by said magnet, all constructed and arranged substantially as and for the purpose specified.

2. The combination of the earth-terminals E E, the battery ll, the resistance-coils E E, the eleetro-magnet 0, operating the signal I), the circuit-breakers G- i i fr, the line of wire connecting the resistance-coils, the wire connecting the terminals with the circuit-breakers (l' and (r,t-he contact-points c c, thelines of wire a b (Z c and a b d c, and the pivoted spring-controlled armaturedevers l" h",arranged to come into contact with the magnets of their respective resistance-coils, and thereby break circuit with the points 0 c, respectively, all constructed and arranged substantially as and for the purpose specified.

\Yl lllllAM MADDEN.

\Vitnesses:

DAVID K. (USE, (tree. )I. ll'oruixs. 

